两河口水电站地下厂房开挖过程微震活动特征分析
发布时间：2019-07-01 13:20
【摘要】：为识别和圈定开挖扰动过程地下厂房围岩损伤区域,分析评价围岩稳定性,构建了ESG微震监测系统,对围岩内部微破裂活动开展实时监测。监测结果表明:监测期间出现了2个微震事件聚集区域,均与母线洞爆破开挖扰动及母线洞与主变室边墙的交叉临空面形成有关。地下厂房微震活动存在明显的随施工扰动控制的时空迁移演化规律,分析其规律特征可为支护施工提供针对性参考。E_S/E_P为微震事件S波和P波能量比值,聚集区域Ⅰ约75%的微震事件E_S/E_P值小于10,表明微破裂以拉伸型破坏为主。同时,该区域围岩变形松弛前,微震事件具有"短期聚集、视应力迅速增加、视体积缓慢增长"的特点,可作为围岩变形预警的定性判别指标。研究成果可为两河口水电站地下厂房后期施工支护提供参考。
[Abstract]:In order to identify and circle the damage area of surrounding rock of underground powerhouse during excavation disturbance, and to analyze and evaluate the stability of surrounding rock, a ESG microseismic monitoring system is constructed to monitor the micro-fracture activity in surrounding rock in real time. The monitoring results show that there are two microseismic event accumulation areas during the monitoring period, which are related to the blasting excavation disturbance of the bus hole and the formation of the intersecting surface between the bus hole and the side wall of the main transformer chamber. The microseismic activity of underground powerhouse has obvious temporal and spatial migration and evolution law controlled by construction disturbance, and the analysis of its characteristics can provide targeted reference for supporting construction. E _ S/E_P is the energy ratio of S wave and P wave of microseismic event, and the E 鈮，
本文编号：2508512
[Abstract]:In order to identify and circle the damage area of surrounding rock of underground powerhouse during excavation disturbance, and to analyze and evaluate the stability of surrounding rock, a ESG microseismic monitoring system is constructed to monitor the micro-fracture activity in surrounding rock in real time. The monitoring results show that there are two microseismic event accumulation areas during the monitoring period, which are related to the blasting excavation disturbance of the bus hole and the formation of the intersecting surface between the bus hole and the side wall of the main transformer chamber. The microseismic activity of underground powerhouse has obvious temporal and spatial migration and evolution law controlled by construction disturbance, and the analysis of its characteristics can provide targeted reference for supporting construction. E _ S/E_P is the energy ratio of S wave and P wave of microseismic event, and the E 鈮，
本文编号：2508512
本文链接：https://www.wllwen.com/kejilunwen/dianlidianqilunwen/2508512.html
